This is how to : Whitelist or Blacklist domain or email address in Office 365
1- use the following link :
https://security.microsoft.com/antispam?tid=4fd1889c-08d5-4339-8c6f-a02bda15a3c5
2- Select Anti-spam inbound policy (Default)
3- Select Edit allowed and blocked senders and domains
4- To whitelist Sender or Domain – select Senders or Domains under Allowed
5- To Block Senders or Domains – select Sender or Domain under Blocked
6- Continue tile you select Done
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